Finding the Third Proportional to 21,015 and 45,729

Step by Step Solution

1. Step 1: Write the proportion equation
   21,015 : 45,729 = 45,729 : x
2. Step 2: Convert to fraction form
   21,015/45,729 = 45,729/x
3. Step 3: Cross multiply
   21,015x = 45,729 × 45,729
4. Step 4: Simplify right side
   21,015x = 2,091,141,441
5. Step 5: Solve for x
   x = 2,091,141,441/21,015
6. Step 6: Final answer
   x = 99,507.09